Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – Polymers from only ethylenic monomers or processes of...
Reexamination Certificate
2003-08-15
2008-10-28
Gulakowski, Randy (Department: 1796)
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
Polymers from only ethylenic monomers or processes of...
C526S317100, C526S324000, C526S286000
Reexamination Certificate
active
07442749
ABSTRACT:
There are disclosed a novel sulfur-containing poly(unsaturated carboxylic acid) and its uses and production process. A sulfur-containing poly(unsaturated carboxylic acid) having a weight-average molecular weight (Mw) of 500 to 4,500 and a molecular weight distribution (Mw/Mn) of not more than 2.5 is obtained by a production process comprising the step of polymerizing an unsaturated carboxylic acid in the presence of a polymerization initiator to thereby obtain the poly(unsaturated carboxylic acid), wherein: a combination of a persulfate and a bisulfite is used as the polymerization initiator, wherein the polymerization initiator is adjusted in such a manner that: the total amount of the polymerization initiator as used is not smaller than 10 g equivalents per 1 mol of the unsaturated carboxylic acid as used, and the amount of the bisulfite accounts for not smaller than 8 g equivalents of the total amount of the polymerization initiator as used; and the polymerization temperature is controlled so as to be in the range of 25 to 99° C. This polymer is used as an essential component of a detergent builder and a kaolin dispersant.
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Fukuhara Koji
Tsumori Takahiro
Yamaguchi Shigeru
Yoneda Atsuro
Bernshteyn Michael M
Gulakowski Randy
Nippon Shokubai Co. , Ltd.
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